INVESTMENTS - Other Invested Assets (Details) - USD ($) $ in Millions	Mar. 31, 2023	Dec. 31, 2022
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	$ 446	$ 450
Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	437	440
Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	9	10
Partnership Interest | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	361	354
Partnership Interest | Fair Value | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	352	344
Partnership Interest | Fair Value | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	9	10
Private equity | Partnership Interest | Fair Value
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	353	345
Private equity | Partnership Interest | Fair Value | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	352	344
Private equity | Partnership Interest | Fair Value | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	1	1
Derivative instruments
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	74	85
Derivative instruments | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	74	85
Derivative instruments | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0	0
Policy loans
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	11	11
Policy loans | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	11	11
Policy loans | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0	0
Equity Method Investments | Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	8	9
Equity Method Investments | Partnership Interest | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0	0
Equity Method Investments | Partnership Interest | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	8	9
Equity Method Investments | Private equity | Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	3	4
Equity Method Investments | Private equity | Partnership Interest | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0	0
Equity Method Investments | Private equity | Partnership Interest | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	3	4
Equity Method Investments | Real estate-related | Partnership Interest
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	5	5
Equity Method Investments | Real estate-related | Partnership Interest | Retained Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	0	0
Equity Method Investments | Real estate-related | Partnership Interest | Ceded Business
Fair Value, Assets Measured on Recurring Basis, Unobservable Input Reconciliation [Line Items]
Total other invested assets	$ 5	$ 5